Fine-crystal transparent alumina ceramic material and preparation method

An alumina ceramic and transparent technology, which is applied in the field of fine-grained transparent alumina ceramic materials and preparation, can solve the problems of low linear transmittance and coarse grains, and achieve the effect of uniform grain size and improved mechanical properties.

Inactive Publication Date: 2012-08-08
SUZHOU KEY MATERIALS TECH
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Problems solved by technology

[0004] The technical problem mainly solved by the present invention is to provide a fine-grained transparent alumina ceramic material and its preparation method, which solves the problems of coarse crystal grains and low linear light transmittance faced by conventional hydrogen sintering, and the mechanical properties of the prepared transparent alumina ceramics at the same time The performance has also been improved, with excellent properties such as high strength, high density, and halogen plasma corrosion resistance, suitable for high-temperature observation windows, metal halide lamp tubes, chamber components in semiconductor equipment, etc.

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  • Fine-crystal transparent alumina ceramic material and preparation method
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  • Fine-crystal transparent alumina ceramic material and preparation method

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Embodiment Construction

[0017] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0018] The present invention prepares the operating steps of a preferred embodiment of fine-grained transparent alumina ceramics as follows:

[0019] (1) Preparation of slurry: 99.91 parts of Al with a purity of 99.99% 2 o 3 Powder, 0.07 parts of MgO, 0.01 parts of ZrO 2 , 0.01 part of La 2 o 3 Put it into a ball mill, add deionized water and alumina balls, use nitric acid solution to adjust the pH to 4, then add 1.5 parts of Dolapix CE64 as a dispersant, and carry out roller milling for 24 hours to prepare a slurry with a solid content of 70-80% material; add 0.5 part of polyvinyl alcohol to the ball-milled slurry, and continue ball-milling ...

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Abstract

The invention discloses a fine-crystal transparent alumina ceramic material and a preparation method. A formula of the material comprises the following constituents by weight percentage: 99.6-99.98% of Al2O3 and 0.02-0.4% of MgO, ZrO2 and La2O3. The particle size of the ceramic is at the range of 0.8 micrometer to 1.5 micrometer, and the linear light transmission at the 640-nanometer position is larger than 37%. High-purity alumina powder is used to be formed by cold isostatic compaction and sintered at hydrogen atmosphere, and temperature rises to 1,300 DEG C, then decreases to 1,150 DEG C and is preserved. By means of the method, the fine-crystal transparent alumina ceramic material is high in compactness, excellent in mechanical property, high linear transmission and suitable for ceramic metal halide lamp tubes, key components of semiconductor devices, high temperature observation and the like.

Description

technical field [0001] The invention relates to a fine-grained transparent alumina ceramic material and a preparation method thereof, in particular to a method for preparing fine-grained transparent alumina ceramics by adopting a low-temperature sintering process in a hydrogen atmosphere. Background technique [0002] Since Coble published the first patent US3026210 on transparent alumina ceramics in 1962, transparent alumina ceramics have been a hot spot in research and development. Because transparent alumina ceramics are sintered in conventional hydrogen or vacuum, since the sintering temperature is greater than 1700°C, or even exceeds 1900°C, the grain size usually reaches tens of microns or even higher. On the one hand, it leads to a decrease in the mechanical strength of the material. Usually, the bending strength of transparent ceramic parts sintered in atmosphere or vacuum is less than 300MPa; Higher fields, such as ceramic metal halide lamps, key components in semi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/115C04B35/622
Inventor 庄苏伟刘先兵
Owner SUZHOU KEY MATERIALS TECH
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